People who doesn't look fat or overweight from the outside (no 'fat folds') and still are considered 'fat' when they are submitted to hi-tech body-scanning techniques (like MRIs), to discover that they are what doctors call 'centrally-obese': having large fat-cells in their vital organs and subcutaneous skin deposits which is high risk for heart disease and can double risk of CDV (cardiovascular disease) in men.

A new relative method to body mass index (BMI) is the Body Volume Index (BVI), which is a faster computer-based digital scan that calculates body-volumes/body fat percentages. Similar techniques to BVI should be made to tell you if you are one of the latest 'fat' category: the 'skinny-fats!

It is someone that always looks dead skinny yet seems to eat what they want and do very little exercise. It is presumably genetic.. their body is small in mass but they have a high fat, low muscle ratio.

Callum Best is skinnyfat. Reportedly, although quite skinny, he has 22% body fat.

This term is used when a person is thin, yet does not eat healthy or take care of themselves. They think they don't need to watch the junk they eat because they are thin. They can be more unhealthy then an overweight person.

Also known as, Skinny on the outside, fat and unhealthy on the inside.

Skinny-Fat

If a person can eat pizza, burgers, candy all day long and not gain weight, they would be considered skinny fat. They can still die from the same weight related diseases. That is Skinny-Fat